I am using Omnisend for my email marketing. I am looking to add a couple of Pop Ups to my web store.

#1 I want a Pop Up to appear when visitors go to leave my site and I want to encourage them to sign up and Subscribe to my site.

#2 If I have a particular product that I want to promote, I want a Pop Up to appear before the visitor leaves the product page to encourage them to purchase this product. I could envision having multiple pop ups for different products that I would select.

I think the perfect app for much of what you're describing would be Privy, this app delivers the functionality you mentioned about customer exit intent. There aren't many other apps that can pull this off quite as easily as my experience with Privy.

In terms of product-specific pop-ups, I would have to recommend reaching out to the app developer and querying whether the integration can support that sort of pop-up. You could also ask if they have any integration with any email marketing integrations like Omnisend.

Their support can be found on their App Store Page, but I'll include it here for your records:

I would caution against the use of too many pop-ups on your site, as it has been established that too much clutter can harm user experience, and cause customers to leave your site. I would suggest thinking thoroughly about which pop-ups are essential to your business, and focus on those.